Lathe.



PATENT OFFcEe'" JOHN L. 'OSGOOD, OF BUFFALO, NEV YORK.

LATHE.

SPECHIGATION. forming part of Letters Patent No. 707,155, dated yAugust19,1902.

Application filed February 23, 1900. Serial No; 6,168.A` (ANO model-l ToalZZ whom, t may concern: y A Be it known that I, JOHN'L. OSGOOD, acitizen of the United States, residing at Buffalo,

in the county of .Erie'and State of New York,

have invented certain'new and luseful Improvements in Lathes,'of whichthe following is a specification.`

The object of my invention is to increase the durability and lifeoflathes and similar machines having guides upon which the carf `closingportions of the guides, and thus holding said guides rigidly in theirproper position, all of which will be fully and clearly p. hereinafterdescribed and claimed, reference being had` to the accompanyingdrawings,

illustrating a preferred adaptation of my invention, in which- Figure lrepresents a perspective view of a lathe provided with my improvedguides.V Fig. 2 is an enlarged cross-'section through a portion of alathe to show Y the preferred adaptation of my invention. Fig. 3 is aldetached perspective View of one form of my improved guide, showing agrooved rod whichf is chiefly adapted tobefttedin a groove in thetailpiece or carriage of a lathe. Fig. 4 is a detached perspective Viewof another oon-VA struction of my improved guide which may `be made insections or in entire lengths and is chiefly adapted to be used as-abottom guide to be set in the lathe-bed.

In referring to the drawings in detail like;

numerals designate like parts. Il have shown a preferred form of myinvention inthe accompanying drawingsy embodied in a lathe, in which 1designates the' bed or frame thereof, 2 the headblock or carriage, and 3the tailpieces.

The bed or frame is provided with parallel grooves" 4, which [extendlongitudinally throughout the entirelength of the same.

The detachable rails 'are formed of hard ened steel or other metal andpreferably with a slightly-tapered lower portion, so that they can beseated rigidly in the grooves 4, which lare correspondingly tapered.'(See Fig. 2.)

but also as an The vhead-block or carriage and the tailpiece instead ofhaving the usualfgrooves formed therein to receivethe rails may have.grooves 6,' circular in cross-section; in which detachable'rods 7, ofhardened metal,-are tted,' said rods having grooves 8, iniwhich theprojecting portions of the railsextend and fit, thereby. correspondinglyincreasing the durability ofthese portions of thelathe...

In Fig. l four rails andffour grooved rod's are shown, but more orle'ss'may be used. They may be inverted or otherwise changed in form, or theupper grooved rods in some instances may be dispensedwith'.

The chief advantages of my invention are bedded in groovesor'depressions in that part i of the machine to which it is attachedthroughyout the entire length, the metal of the lathe part partlysurrounding and strengthening the rail or` rod and the rail o r rod inturn strengthening the lathe.

In preparing my improved guides I first cut the proper length and theproper size in crosssection, then harden by rolling, hammering, orVVtempering, and finally grind the surface down by any suitable means toremove any distortion, thereby forming an absolutely true guide ofsufficient hardness to prevent indentations by any ordinary mea-ns, suchas the dropping of a tool or other metal being worked thereon. f p l Myimproved guide when rigidly set in position in the lathe formsa part ofthe same and servesn'ot only as a guide 'o fharder and stronger metalthan that heretofore employed,`

strengthening-ribfor thelathe of harder, more condensed, and strongermetal. l friction is appreciably lessened and wear is independentdetachable IOO substantially prevented, owing to the smoothness andhardness of the contacting surfaces of my improved guides.

I claim as my invention- 1. In a lathe, a bed or frame having grooves,

rails of hardened metal itted in said grooves and having portionsextending above the surface of the bed, a carriage having grooves on itsunder surface, rods of hardened metal fitted in said grooves and havingdepressions in which the extensions of the rails project.

2. In alathe, a bed or frame having grooves, rails of hardened metalfitted in said grooves and having portions extending above the surfaceof the bed, a carriage having grooves on its under surface semieircularin cross-secrails project.

JOHN L. OSGOOD. Witnesses:

L. M. BILLINGs, A. J. SANGSTER.

